Answer
a). 341 m/s
b). 0.27 sec.
Work Step by Step
a). 1 mile = 1.609 Kms.
$763 \,mi/hr = (763 \times 1.609 \times 1000) \,m / 3600 \, secs$
$=341\, m/s$
b). 1 ft = 0.3048 m.
300 ft = $300 \times 0.3048$ = 91.44 m.
So, time taken to travel 300-ft football field =$\frac{91.44m}{341m/s}=0.27 s. $
